Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Troubleshooting Divinity Engine 2 NOT Launching in Steam

I had the same problem and stewan's post above helped me figure it out.

There is a config.xml file in C:\Program Files (x86)\Steam\steamapps\common\The Divinity Engine 2\DefEd\Config that has the line:

<DataPath>C:\Program Files (x86)\Steam\steamapps\common\Divinity Original Sin 2\Data\</DataPath>

Change that to:

<DataPath>C:\Program Files (x86)\Steam\steamapps\common\Divinity Original Sin 2\DefEd\Data\</DataPath>

(modify for your drive/folder location)

And you should be able to start the Definitive Edition version!